List of practice Questions

Benzenediazonium chloride on treatment with KCN in presence of copper powder gives :

BeCl in vapour state and solid state -

_______ being highly reactive is used in the extraction of chromium and manganese.

Bells are made of metal and not of wood because

Benedict solution provides

Benzene diazonium chloride reacts with hypophosphorous acid to produce:

$ {Be2C +H2O-> BeO +X}$ $ {CaC2 + H2O->Ca(OH)2 + Y}$ $ {Mg2C3 + H2O-> Mg(OH)2 + Z}$ $X, Y$ and $Z$ are respectively

Beat phenomenon is physically meaningful only, if

Beats are produced by the superposition of two waves of nearly equal frequencies. Of the following, the correct statement is

Beats are the result of

Bat pollinated plants are known as

Bath sponge has

$ {BCl_3}$ does not exist as dimer but $ {BH_3}$ exists as dimer $ {(B_2H_6)}$ because

$ {BCl_3}$ is planar molecule because in this molecule boron is

barometer reads 75 cm of mercury. When $2.0 \,cm^3$ of air at atmospheric pressure is introduced into the space above the mercury level, the volume of this space becomes $50 \,cm^3$. The length by which the mercury column descends is

Based on the figure given below which of the following statements is not correct ?

Basic unit of ecological hierarchy is

$BaSO_4$ is insoluble in water due to its

Balbiani rings or puffs occur in

Band spectrum is produced by

Barbituric acid and its derivatives are well known as

Bark does not include

Baculoviruses (Nucleopolyhedrovirus) do not show

Bag $I$ contains $3$ white and $3$ red balls and bag $II$ contains $5$ white and $4$ red balls. $A$ bag is taken at random and a ball is drawn from it. If the ball drawn is white, then find the probability that it was drawn from bag $II$.

Bakelite is a product formed from